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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bec9e5790aa7c263b4f81af39ef054c6c38002db630283be826a51dff26951' 
  AND token = 'yRGU3zAbb2reaF90oR2/2or87F1ACFWiw0Iw8g3ooXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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