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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ce46688f485fee569c16953d5149a9e0ca632adabd2564432968e59d6e0c8e' 
  AND token = 'DpkloxRKOM01NGtGFxBnYveIuE94FruJ/nWGxDcDS4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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