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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bb1c97269db779c37abf79cbb42b1752daf1164c85b5242df216b045bddd9f' 
  AND token = 'xjciP1i7MtWueY55hhRRLXQpVL8FOFi1dAuJsZu9x30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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