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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae4891a0c6f2dc4b4a69fd61f06db5c5c1e0a98194da5833f30ed614cb64f40' 
  AND token = 'u23qvVZIAWjLxEU6fG4LwCTsTGL7LsXPzR/nwfS9a9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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