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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce4a8bb7f0ce7a7d925573fde8c02ce135b0dc086f33be1b48c177e5db6cc0a' 
  AND token = 'TW/QjKs1KuEwvajtWxzC1k6FbwrR4bSBx19mkMeB0aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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