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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e283955f9728bf317a6b65ef841ce1c6c88f07dbaa839706e1eb413e6d251b20' 
  AND token = 'r5ftZXq9Snh2whAZ8zisF2UHNpc/7WHp8VmBDUuCI3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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