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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59da1f1a23e0de1f02995c252320e214eb5c22bc04e64e8a2fb3aa55ebb06c70' 
  AND token = 'qYbysvcq9VCs43OxfQVH2a9AzFNKqZcv1Q/VCtQ1F9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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