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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f601466e1b76ebd253afecf857e679a9414e44580c142c4942cd14ca735d02' 
  AND token = 'wqXh3RmaNel4NtZLkGa30Mme9g3ea+PHe6kWbOFschU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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