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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da0199f1e1b83797968c21f879d0930511f66dab5f233ba8b1a91d7bfb57352' 
  AND token = 'd+N/+o4M/zIp3VHCq6W5lfkdEwFtb36WEjfbpeye/yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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