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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34d9b5f65675008214409d26640518a2805b4b047219b6b04846c317ede0c07' 
  AND token = '9onmdcXQRfPicFL4VcBO9LnYaE4UKM85ssBJCl0Wmr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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