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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91166c0f10298b0930a50f475c61624f459b8d4aeb47429528968928e044a7cc' 
  AND token = 'xuOKC72bINrAu7JsQxhrn0gWVMYJjJjV0R1sMQa/DiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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