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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c662d260d34067e5308add680f933ac80baf409e9ba6b4562fcfb225c5367429' 
  AND token = 'nVN0x7eHVe3ZyzL20KZhLKGtWG7oqC5IPp4TH2Nj0T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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