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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f59523836ceeaaeec1406732d320c6af2265fdd793d79dd5ec8bc2ee8865a2' 
  AND token = '8KrnMENtQCDYngQTWTNXRf6Q5cveiiU+aS3vMvrOwgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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