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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc8ea2c64cb435fb934ec977f71fc8ce8dc253c390050e27cccb401ebd1cd32' 
  AND token = '5gSU1kSC/JiT3s3KPNB9gbIxkJRGvnk3vl3izt0BmEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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