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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3f96047558e323429f21163d8bb0992e6ddd0036c1c156719bb6c6f0594df0' 
  AND token = 'SR3OlrszjZ4iwsA8Ovt8b7TPjANP5E7j7GCP4RcWuVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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