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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30df5ca0d66835eb8217dacc1daa8c4abc7c40a4fdbd12b573e6c4395f84caef' 
  AND token = 'oh5A6a/yUSZDN3AbqIFDS/ET8X3INiOdBY7oCny7l6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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