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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcfb4bd72215a775bb19ebf0ae130962e4b5726f0aa40c2dbbcd6a200e165fd' 
  AND token = 'SYbwP+5z77haazk2GyuiYraBzziA+gXWstTPQHbX5sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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