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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '189955bf637796353ee3d49884b8e5267270da254a9ffdcccc566eb28280bca2' 
  AND token = '/zHfye3hUw9AtkGYuic/4Tgy6xJ1AFcXMEq+AYN/AmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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