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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6568c6b71f2bf4046e2593409b925d815ab6ce096962855561c87fd982018d' 
  AND token = '2V/sYpLb9Gr7VFEnaJ24qXdOfzyYqLfLDNVsamb4HAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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