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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd958b2ffcd0881c34b0b2270ad5b2821818c9560370e821db8aac4a2296020' 
  AND token = '8oG9gO/GxU9fcBYB+cXSHKLinHdHWeW090svcagXTGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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