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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2d9b5384f930927e1b397cda5990451d63090c2add266f7f229a06b9ac7b7b' 
  AND token = '+pr6rHeu/f3KJDcl/iF8VBd7aID7A2u0gYdnJiat7/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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