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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a3db509caa75d8efdae7f6424073142ee35ad009d0a4ba0e877ce3efdcc6d7' 
  AND token = 'eIiZx2wN8yq7hAE137aSoQs/ufZIIcf5dD/5sGOvXG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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