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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb7d57af8e451f7f8cdc7be284789ccc444ae0e002606c0218a5bb685b81836' 
  AND token = '/fvQ0Plez+yHzX+zQFNW3PE04A/kjwMkFODWMm+doyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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