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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73f3b68d9cacb927ae838f71281b1dddd2aeea8bfcd1b4cd7cdbe45d5b81d55' 
  AND token = 'W4J+l0AirBkyItny96uBe2xh4XHr+XU5Jf1NYKBUExU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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