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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba7c2f4afba209141696af8d350d90bbd11db265fe4d961f354e7e1088aa46e' 
  AND token = 'gBWTv7EX4jhOxrcpCpKMeRCar2HjT9cqGiZ3b+UnM6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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