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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799cf5b164917c303c1354c57353d9168691dcb18b6f764b9c59c68ca5e7ddca' 
  AND token = 'hljA/8joXD0CtskBql9whogAmzayFfDNNKNnKdC2L9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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