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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88695f61d89dd59b04ff8eb5cb5e34de6b19da3c4f58c50c8abcd4eb63fd2b39' 
  AND token = '/ObTkdj39dFcwjRpzIFQZUpZgvV3kI2IYdx+S4dswig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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