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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f312ede28fbf1e157b3a0795eb86d3343c32893c1367a26ad3a984a3920eaaeb' 
  AND token = 'kvI0JXmICb4IQeC+29CRwkTxVBP+ms5K3gPKSd14/Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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