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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a541f36f704f99f644499a65db3444893b489badfc6e175ce16d67d1de23c956' 
  AND token = '/aZVZAy6iCWr7aKHcum9E0a5YYk7o/+8WVIvb3341PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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