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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ddc2e5f82615789b25678e003e3fe27d02dcf32a217638e7ef34ae13432dd4' 
  AND token = 'hYuScQ2zqyR5UTCCjzLPSe1FuVBd3W8lW0E5h5Y3lMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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