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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6202a5d17e6c6dca5ffa11273880a0d2dc0479ef87e6f1417a6f34f27c6fbb1a' 
  AND token = 'MOiWT93ivmPHx90xL2D9w91uaiPrnoaocicwKeWXzQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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