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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22871d6f8bef812a10e302b9d0defd5ddb6010bcfedc1cbda958a846e61dbe61' 
  AND token = 'E6zMqxz7//xvrSG92UePUnHp5jdWHBQYyKo6FV3PA74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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