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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085385da399b15adc2de6665e51676d4d87f98b4406ccd98d9ae7ad04625529a' 
  AND token = '5aQMGKYt2lxHnUYOO9WwqdArrvj5nlX9yEn9Sb8CXyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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