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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f6152abdb4702b72b43de879bf373bf36a5a6d8b1a92573f1749c94126c0be' 
  AND token = 'o1K8szKS2woCMhLK68BbOnIXErd1uxeHQNpVTYwcp2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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