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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c98d96768bedcfcec474739f1d0a102e6159a05c9bf5f337982198058e3276b' 
  AND token = 'Y/nS8/ez+z7005fygqEHeLQ1nbuP5QXMdMZ5zT2DR3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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