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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76abce4ace71a907fec2689f6b83dfeba50de70b5fa40321006fc201e8ce91e0' 
  AND token = 'uMOHorn1fzZHvT6g5DfWNpsNzOqQkmpv+UPPzgVz5Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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