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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a90c975dace1cade133ccb807f4418ab7a44c8dbccaef1a65f5459777491183' 
  AND token = '/DHQETaVfQ5HGUNicclF9DrvDiDwxKHB9zI9ZKYakfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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