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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1d57adeac78d31fcf2ad55d83fba23c0216f543c196ca0fb9819cf87a31aff' 
  AND token = 'a91KykSlyv2lE71YDSa5/JMAcyh1rVeAh7v9rzXh2Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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