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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b713b237e1e407d7f8df29403be37692da010148a7826381b671dc131a411a' 
  AND token = 'RxGvBnxy3L9LdjzGGPsb8ePa/o33RTC9ZRi9BAB1TUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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