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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9857f6d2757bc8f53992e0ba0c469d3733017c42111c65d6b300a51bed0f5a9' 
  AND token = '1px687iUtmmVOpH9mbu+u6L2hSq3e1BiTInkF1hYaps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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