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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c1812419fff61f61959500773d9c09d6ba339d641f1b1a616094f6eb001920' 
  AND token = '9QZBm+aU7xQPoIsqTHOl6ZKEuyCEK4jXNLOxWWZwef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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