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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1deda4526b9a7a05c51a4163aa24920f05708fef56bf2fb15ef9befa9db9cf5b' 
  AND token = 'jAPxAQebtAlJzQsnudAbyjon6Hhiv9jFdJjLWIvYbG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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