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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19636c3c0f6bfae9120907b5b17f9b19adfd057008a8aadc31d234dd6787840' 
  AND token = '6+zD/Y2IC4EIcsAo1xBxa1UxOOyIDteCBU/LWFjY3tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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