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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8219cde465b6de0cd8b24fc7ea47cd55369828f0bfd95149980170372eabd0' 
  AND token = '/+v3Ny2tj5RYIhNJM7XX1yOipzZDOZ79IEhF4kNJ7ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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