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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de58edd1fbcefc15a5462ee740cac2c0d55a77c3c7bc2f3fd47ebb2fa811872b' 
  AND token = 'NXnnjZhgbn0+w5mb2U06sllJ4NrdV4XDRVGL5xWd7ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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