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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda6a9df83d0486f31f70fb3434da28c561fc384d247371e9655d6a9afbbc6c2' 
  AND token = 'hvrsozeIk7J3q4If0NgZSsf9oNE/vkb2qJWJQKZEtIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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