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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a96323e70d42713855af709fbd5d3580fa394877ef24ec8417f026c218a612d' 
  AND token = 'WHKF1lgSKShlU5UHCyiOKkdsm9xEjz9wgmKU8fzI918=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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