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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18beef4b57b3c07206ca2d8b2088d9136adb1a3e5eb15d51d7dd28475bf13b28' 
  AND token = 'K3xqUrxbgRIt4aAutEDWjS68tyNt9GQToYphQE5VNSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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