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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd854291eafc7fbdd9cc21e9b077c2ad9d0988a878012222b1b938d49bd5856f9' 
  AND token = 'coomfr19h6/1y9rSKKehBmAZ7pL6QDHOyOmDx7EFlNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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