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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e1408087e8a1396a91a6ba106786673c58f4d6e7c9273dcae826285e9a7c41' 
  AND token = 'Wvi/a/52hQ2bHZ/oiqJ/Yp7uhL8LB8ga/ST/MGrZToY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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