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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46643dc94aad494ddf11046d518be20de1795a62c807115e523a47f4f7a6bdd' 
  AND token = 'O8LAo6B1TalEIHD0hRKDKbjneMd+Gdk/YRk/giJ7i5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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