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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fc5376055a5f18f5a605a3893859bef05ecf13820f518c85fd6eaaa79a1554' 
  AND token = 'QcwE25vIjxV9MmyisiJbjpodN6m6/3CdP+I3fyt8tt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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