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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3fec1f2ad342b1dc7931ed5bb8b4183a56187a0da11e763db8a10c46b8d8fc' 
  AND token = '1xQvscaUZHYizDBmDt8DUJmkbhQxp2tclVZtsGXSuO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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