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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2717c89d2494024abf227a60e54499dedd78ca25a7d8c1d7acb2024dc49e792d' 
  AND token = 'AMqY92S0R87/3DoYP3XyUb6YS9sNG+YJ3bClGSZkd+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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