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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bbfddae35dea664e9d4e603a3e1ca4024b5d9c406e81ca2a89f7a4031cc6ed' 
  AND token = 'oOx6ckJZQtqx5CwDgRYonfuGBgsgCyNIXDva8gacqxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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