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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb36e339392238835fabb771f60fade73a3bef8c0883f3362169318fb5c905dd' 
  AND token = 'lW9knBvc5f+WCDPLBBKnt0KhT23CmSN4ziqLFmtkyQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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