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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25c201a413c0d1fc83aca3fe18aa805ce1ea3df0c16ed39ecb75fdeb4f82d96' 
  AND token = '6e5UhJpsBedryrLJIFfq2Oi4ZT4SJEI4lvOeB0lnafg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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