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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2035d35c393947c1dcd608e522f981bf9c2ccf0373b397122a7dde33f4cbb3e4' 
  AND token = 'i9XAzjZfS06SYD19saIEpRhetr6k9PSZwN8cnmEnNsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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