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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aad5b3648df3df3e7cb1f9ff25a382178c6d3aa6d0c408e7e0bd14a3c4513f6' 
  AND token = 'Owtj7zD8SNzUfKNPdEVCpgS6/stpJAATHFG6jy38u2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}