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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6043c2a566deb697081187730bf775fe131c0191d11a7b441e7b8bf01503c7' 
  AND token = 'SYkteUWGmZ71PmqQs8PEuRQmm0Qa5JnHsWmomH1PBuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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