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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d30dd8a5e2ced609a8666e1d8b21c5f2d77aabae56570c7f536f537fabd201' 
  AND token = '8JfBcTbofDCb+Umk32AN1GkF8mHCQbhVewX3xFbkR30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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