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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d99e8bdf93c58d557a3d326f1e57f69821fe175e2ec55e8657e17bdabaa254' 
  AND token = 'WXRyLzZrMRhHXhLh2usDf4eiTtKlD+8Xc/PMhZASNOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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