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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea17abd3eae6f29cd8b1160476959fda9b72b9db265ae3f6f699e8b3684c03e1' 
  AND token = 'NSVWV+b3yyfVfAsT9NM9fSI9mqLkNhaQGggECkmUY8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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