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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c2b5dda35d512334d095211d85b79f593a0bc448a3aca57b7cae652748e26f' 
  AND token = 'Vthat41ZM7YltbpAAwAO4TwabXrMJhx60H5BN5K34+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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