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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2617cd16bc00ca2d7a688ba7cc69d5532ad4591a60f83d7a5b075ed86871d95a' 
  AND token = 'qtJbnHNTA3Ub0+G6BUbOHTsjR744MaPBSeIsCMZI6mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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