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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ef8a806debe0f4e32d164ebc7888c72b73d19e092b6d21714d3f698f2e4e5a4' 
  AND token = 'fpuoupHZQ7g3qxED8q9csGflOOx2ouBfiChKjiWsZ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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