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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6f9fcc5944ba4f06c39c5542daf56e020b10facab165943468ffbce59d5980' 
  AND token = 'ng4yncd4vocqwSTr4F8tBgoYHepkYaYdsRYvj6HBsL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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